Illuminated surround and method for operating same for video and other displays
First Claim
1. A display apparatus comprising:
- a screen adapted to display an image;
an illuminated surround adjacent at least one edge of the screen and visible to a viewer of the screen wherein light from the surround is directed directly to the viewer;
an ambient light sensor located near the screen; and
a control coupled to the sensor and to the surround and which generates red, green, and blue signals to set an intensity and color of the surround, thereby to control a brightness and chromaticity of the surround responsive to the sensed ambient light level, wherein chromatic adaptation is countered and apparent contrast improved.
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Accused Products
Abstract
In a video or other screen display apparatus, a surround to the actual screen is provided whose light output is variable in order to compensate for the effect of ambient (room) illumination on apparent contrast and chroma of the displayed image. The relationship between ambient light level and the surround illumination is an inverse power function. This provides the effect of making the viewer perceive that the entire room is brighter than it actually is, resulting in a desirable change in his perception of brightness. Thereby, the chromaticity of the surround is variable to allow a match to the calibrated white point of the video display. The apparatus includes an ambient light sensor whose output signal is provided to a control system driving the illuminated surround.
54 Citations
26 Claims
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1. A display apparatus comprising:
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a screen adapted to display an image; an illuminated surround adjacent at least one edge of the screen and visible to a viewer of the screen wherein light from the surround is directed directly to the viewer; an ambient light sensor located near the screen; and a control coupled to the sensor and to the surround and which generates red, green, and blue signals to set an intensity and color of the surround, thereby to control a brightness and chromaticity of the surround responsive to the sensed ambient light level, wherein chromatic adaptation is countered and apparent contrast improved. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising the acts of:
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displaying an image on a screen; providing an illuminated surround adjacent at least one edge of the screen and which is visible to a viewer of the screen wherein light from the illuminated surround is directed directly to the viewer; sensing a level of ambient light near the screen; and controlling a brightness and chromaticity of the illuminated surround by generating red, green, and blue signals to set an intensity and color of the surround, responsive to the sensed ambient light level, wherein chromatic adaptation is countered and apparent contrast improved. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification